Electrical Design
‑85‑
Table 3–15 Terminal description
Terminal Pin
Name
Wiring Description
X1‑1 SHIELD
For connection to
the shield
Recommended cable: four‑
conductor shielded twisted
pair cable Cross‑sectional
area: 0.3 mm
2
to 2.0 mm
2
X1‑2 485+
Twisted pair
X1‑3 485–
X1‑4 GND
Connection is
recommended
S1‑1
DIP switch 1
‑ Termination resistor
selection
Valid when S1‑1 and S1‑2
are all set to ON
S1‑2
DIP switch 2
‑
The following figure shows the terminal wiring.
Figure 3‑29 Terminal wiring
Bus topology
The Modbus RTU bus supports a maximum of 31 nodes (excluding the master). Set
the termination resistors of the master and the last node to ON. The following figure
shows the networking. If the number of nodes for networking exceeds 31, use a
repeater.
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